2. Manuallv calculating the tstatistic An obstetrician wonders whether her patients gain the same amount of weight over the course of their pregnancies as pregnant women in the United States did 10 years ago. She collects the following random sample of current patient weight gains: Patient Weight Gains Pounds x 3? 3D 3D 24 45 25 3? 2'3 32 1.9 Assume that the distribution of patient weight gains is normal. The obstetrician's null and alternative hypotheses are Ho: H = 28; H1: # # 28. To calculated the t-statistic, the obstetrician first needs to calculate the sample mean (X) and the sample standard deviation (s). The value of X is and the value of s is . The value of the t-statistic is Select a Distribution Distributions 0 1 2 Use the Distributions tool to determine the rejection region when the significance level is a = 0.05. The obstetrician should reject the null hypothesis when . Thus, the obstetrician reject the null hypothesis